<template>
  <div>
   <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader :addTodo="addTodo"/>
      <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
      <MyFooter :todos="todos" :checkAllTodo="checkAllTodo" :clearAllTodo="clearAllTodo"/>
    </div>
   </div>
  </div>

</template>

<script>
import MyList from './components/MyList.vue';
import MyHeader from './components/MyHeader.vue';
import MyFooter from './components/MyFooter.vue';
export default {
name:'App',
components:{MyList,MyHeader,MyFooter},
data(){
  return{

    // 由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中(状态提升)
   todos:JSON.parse(localStorage.getItem('todos'))
   /*  todos:[
      {id:'001',title:'读书',done:true},
      {id:'002',title:'看报',done:false},
      {id:'003',title:'画画',done:true},
    ] */
  }
},
methods:{
  // 添加一个todo
  addTodo(todoObj){
    this.todos.unshift(todoObj)
  },
  // 勾选 or 取消 勾选一个todo
  checkTodo(id){
    this.todos.forEach((todo)=>{
      if(todo.id===id) todo.done=!todo.done 
    })
  },
  // 删除一个todo
  deleteTodo(id){
    this.todos=this.todos.filter(todo=>todo.id!==id)
  },
  // 全选 or 取消全选
  checkAllTodo(done){
    this.todos.forEach((todo)=>{
      todo.done=done
    })
  },
  // 清除所有已经完成的todo
  clearAllTodo(){
    this.todos=this.todos.filter((todo)=>{
      return !todo.done
    })
  }
},
watch:{
  todos:{
    deep:true,
    handler(value){
      localStorage.setItem('todos',JSON.stringify(value))
    }
  }
}

}
</script>
<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
